Accession Number : AD0264308

Title :   STABILITY STUDIES OF QUARTZ CRYSTALS FOR SATELLITES

Corporate Author : GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION

Personal Author(s) : BELSER,R.B. ; HICKLIN,W.H.

Report Date : 30 JUN 1961

Pagination or Media Count : 1

Abstract : OVER 100 100-Mc AT-cut quartz resonators were made and stored at 0 C and 60 C or cycled through the temperature range 0 C to 60 C once daily. The units have consisted of resonators operated at the 5th, 7th, and 9th overtones and were plated with Ag, Al, or Cu. Frequency measurements have been made by a bridge and counter method. The standard frequency was derived from a bank of 3 oscillators monitored against the 18kc signal of radio station NBA, Balboa, Canal Zone; an Atomichron served as a standby standard. The NBA signal was received in Atlanta, Ga., to an accuracy of 6 parts in 10 to the 10th power. The more stable units have been 9th overtone units coated with Ag. Several of these have held + or -5 parts in 10 to the 8th power more than 180 days. Radiation damage was conducted by exposure of 12 stable 9th-mode units to approximately 1 x 10 to the 6th power rad/hr. A dosage for 30 min at the highest intensity available resulted in a negative frequency shift of 5 to 10 ppm. Aging at 60 C thereafter was upward at a rate of about +2 x 10 to the -8th power per day. For a dosage of one hr at a lower intensity, more in agreement with that to be expected in the Van Allen Radiation Belt (2 x 10 to the 4th power rad/hr.), shifts of about -2 x 10 to the -7th were experienced. (Author)

Descriptors :   *QUARTZ, *QUARTZ RESONATORS, ALGEBRAIC TOPOLOGY, ALUMINUM COATINGS, CATHODES (ELECTRON TUBES), COATINGS, CONVEYORS, COPPER COATINGS, FREQUENCY, GAMMA RAYS, MANAGEMENT ENGINEERING, MEASUREMENT, PLATING, RADIATION EFFECTS, SILVER, STABILITY, STORAGE, TEST EQUIPMENT, TEST METHODS, VAPOR PLATING, VERY HIGH FREQUENCY

Distribution Statement : APPROVED FOR PUBLIC RELEASE